Electrical signaling system and device therefor



Aug. 29, 1939. (w. R. M. VERY ELECTRICAL SIGNALING SYSTEM AND DEVICETHEREFOR Filed April 27, 1956 INVENTOR WILLIHM BM VERY ATTORNEY PatentedAug. 29, 1939 ELECTRICAL SIGNALING SYSTEM AND DEVICEv TREFOR William R.M. Very, Philadelphia, Pa.

Application April 27,

3 Claims.

This invention relates to improvements in electrical signaling systemsand devices therefor, and has for its object the provision of a systemwhereby the condition of an electrical circuit may be indicated byeither visual or audible means, or

a combination of both such means.

Another object of the invention is to provide a device of the abovecharacter whereby the condition of an electrical circuit may beindicated at a remote point. I

A further object of the, invention is to provide an electrical signalingdevice comprising a compact unit structure which may be used in avariety of places, such for example as in the tailll5 light of anordinary automobile, and where, in the event that the regular lampshould fail, an auxiliary lamp will be automatically switched intocircuit while at the sametime an audible signal will be given.

The invention consists substantially in the construction, combination,location and relative arrangement of parts, all as will be more fullyhereinafter set forth and as shown by the accompanying drawing andfinally pointed outin 5 the appended claims.

From the following specification, it will be evident that the signalingdevice herein disclosed may be used in a large variety of circuits andthat the main circuit, hereinafter termed the work circuit may includeone or more lamps, amotor or other electrically operated device,-or aplurality of signal lights, relays or other devices such as used instreet lighting circuits, railway circuits or in fact in circuits whereelectrical apparatus and devices are used, and that the auxiliarycircuit, hereinafter termed the telltale circuit may be equipped with alamp or annunciator drop any other means to give a visual signal, and.that any suitable means for to producing an audible signal may be used,or a combination of both visual and audible signals y B p oyed in thetell-tale circuit.

It will also be obvious that the signaling de-' vice may be employedwith any suitable Source of power, depending on the apparatus or deviclocated in the'work circuit, and that through simplerelay mechanism ofany well-known ch acter, the tell-tale circuit may be operated from alocal Source Furrent other than the power source.

As such modifications are well known, they are not described herein.

For the sake of illustration, the invention will be described en r llyas applied to work circuits containing lamps and more specifically incon- 1936, Serial No. 76,584

nection with a unitary device adapted to be plugged into a lamp socketof the ordinary tail light of an automobile.

In the accompanying drawing:

Figure 1 is a schematic diagram of an electrical signaling systemembodying the invention and employing an electromagnetic relay foractuating the tell-tale circuit;

Figure 2 is the system, same as Figure 1, but employing a thermostaticswitching mechanism; 10

Figure 3 is a system similar to that shown in Figure 1 except that therelay is included in shunt with a resistance serially included in themain circuit;

Figure 4 is a diagram of a system similar to Figure 3, except that athermostatic switch is used to actuate the tell-tale circuit;

Figure 5 is a top view of a self-contained unit device embodying theinvention, and particularly adapted for use in the tail light of anautomo- 20 bile;

Figure 6 is a sectional view on the line 6-6 of Figure 5; and.

Figure 7 is a view of the unit device shown in Figures 5 and 6 pluggedinto the lamp socket in an ordinary automobile tail light, the casing ofsaid lamp structure being shown in section.

In Figure 1, the numerals l0 and H denote the conductors of a workcircuit which may extend from the apparatus to some distant point and 30which may include any electrical device such as a lamp l2. Conductor l0may be connected through the terminal l3 via conductor M to a suitablesource of current such as a battery 15 which is connected via a terminalHi to a winding I! of a relay generally denoted by the numeral l8 havingan armature I9 and a contact 20.

The armature I9 is connected to one side of the winding l1 and via aconductor 2| is connected to a terminal 22 to which is connected thecon- 40 ductor I l of the work circuit.

As shown in the figure, a circuit may be traced in which the battery I5,the work circuit, the lamp or other device l2 and the winding of therelay I1 are included in series. The relay is therefore 5 actuated, thearmature l9 being drawn away from contact 20 as long as the circuitthrough the device I2 is intact. 4,

Assuming that the work circuit is broken by reason of any failuretherein or in the device I2, 50

Obviously current will momentarily cease to flow through the winding I!of the relay, and consequently the armature I9 will be released and willclose against contact 20.

A circuit may now be traced from the battery 55 v g- 29, 1939- J. B.WARDEN 2,171,153

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